Your buyer must be close to the US border if they have a US address but you should probably confirm with them that they will be sending it from the US. It's unlikely that you will be able to purchase an actual label from Morocco but you can ask the buyer to to find out how much the label is going to be or you can go to the US site (usps.com) and you would have to send them the money for the label through Paypal. The package would have to be sent Priority international in order to have delivery confirmation and will be fairly expensive. You could also have them use UPS, DHL or Fedex although the cost will probably be higher and you might be able to purchase a label for those services at your end.
However....unless the buyer is using a company that physically takes their parcels from Canada to the US, the buyer probably cannot cross the border on their own because of restrictions on the border right now.
Is the item going back to China or to Morocco? If it is China, the buyer could use Canada Post Xpresspost. But Canada Post is not accepting parcels to Morocco right now.
Sorry that there really isn't an easy answer but international returns can be complicated and even more so right now because of the Corona virus. I assume that the buyer said the item wasn't as described or that there is a problem with it and that's why you are paying return shipping? If the item is not too expensive you might want to refund without a return but that is up to you.
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